S-RNA-5 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

S-RNA-5

Safety grade: A

This ingredient is derived from yeast and works to help your skin retain moisture and maintain its natural barrier. It's used in skincare products to support hydration and overall skin health. It functions as a humectant, drawing water into the skin for a smoother, more supple appearance.

Graded using: COSING.

Last verified: June 9, 2026